Foundation And Flandry

I browsed Isaac Asimov's Forward The Foundation in a charity shop and was doubly grateful for Poul Anderson's History of Technic Civilization. The common theme is the imminent fall of an interstellar empire but how different are the two accounts.

There are also structural parallels: 

(i) The earliest written part of Asimov's series was called a Trilogy because its first book publication was in three collections. Anderson's Captain Flandry series, although not marketed as a trilogy, fills two collections and one novel.

(ii) Anderson wrote three novels about the younger Flandry. Asimov wrote two novels about the younger Hari Seldon.

(iii) Anderson wrote two novels featuring Admiral Flandry and four shorter works about later future history. Asimov wrote two novels about later Foundation history.

(iv) Anderson decided that his Polesotechnic League series was a prequel to his Flandry series. Asimov decided that his Robots series was a prequel to his Foundation series.

(v) In both cases, there are works set in intermediate periods.

Given book sales, there must be a lot of people who have read Foundation but not the Technic History and there is even a Foundation TV series. Something should be done about this.